JP3537404B2 - Vehicle power supply device and vehicle display method using the vehicle power supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for a vehicle which can be exchanged with a battery mounted on the vehicle, and more particularly to a power supply device for a vehicle for supplying electric power to a vehicle-mounted electric component in an exhibition hall or the like. .

[0002]

2. Description of the Related Art Vehicles include lighting devices, car audio,
Various in-vehicle electrical components such as air conditioners, wipers, and power windows are mounted. FIG. 14 is a schematic block diagram showing on-vehicle electrical components of a vehicle when a battery is mounted.
The battery 50 is connected to the generator 5 during operation of the engine.
1 is charged. The lighting device 52 can be operated even when the ignition key is not inserted into the key insertion slot. On the other hand, a generator 52 at the time of engine start, a car audio system, a car navigation system, an air conditioner, a cigarette lighter socket, a door lock, an anti-theft device 53, etc., are powered by the battery 50 by setting the ignition key to the accessory position. Supplied. In addition, the wiper and power window 54 can be turned by turning the key from the accessory to the ON position.
Power is supplied from the battery 51. Further, when the motor is turned from the ON position to the START position, the starter 55 is started, and the engine is started.

[0003] However, in a vehicle exhibition hall or the like, there are customers who try the riding comfort of the vehicle and the operability of the various electrical components 52, 53, 54 described above, but mistakenly move the ignition key from the accessory position to the start position. Since the engine may be turned, the engine may be started and the vehicle may be accidentally moved, which is dangerous. Further, when the engine is started in the indoor exhibition hall, the exhaust gas is filled inside the room.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to eliminate the above-mentioned drawbacks, and an object of the present invention is to provide a storage space that can be exchanged with a battery mounted on a vehicle so that the exhibition space can be replaced. It is an object of the present invention to freely test on-vehicle electrical components of a vehicle without operating an engine of the vehicle, and to display the devices safely.

Another object is to provide a plurality of interchangeable terminal heads at the output terminal so that the same vehicle power supply device can be used for the terminals of different vehicles depending on the type of vehicle. Power supply.

Still another object is to form the pair of output terminals such that the positions of the pair of output terminals with respect to the surface of the housing are switched, so that the vehicle-side terminal drawn out of the vehicle differs for each vehicle type. However, there is a need to connect the output terminals with the corresponding polarities.

Another object of the present invention is to provide an insulative protective shield that covers the upper part of the pair of output terminals so as to be detachably attached to the housing, thereby preventing a short circuit caused by carelessness of an operator. The goal is to improve Another object of the present invention is to make the insulating protective shield rotatable to further facilitate attachment and detachment of the vehicle-side terminal and the pair of output terminals.

[0008]

In short, a vehicle power supply according to a first aspect of the present invention is a vehicle power supply for supplying power to a vehicle, comprising: an input terminal connected to an AC power supply;
An AC-DC converter 11 for converting an AC signal input from the AC power supply via the input terminal 3 into a DC signal; and an AC-DC converter 11 which is drawn from the AC-DC converter 11 and supplies power to the vehicle. A pair of output terminals 5A and 5B
DC signal interrupting means 12 for monitoring the current level of the DC signal output from the output terminals 5A and 5B, and interrupting the supply of the DC signal to the vehicle when the current level exceeds a predetermined level; A housing 2 accommodating the AC-DC converter 11 and having the pair of output terminals 5A and 5B provided on the surface thereof.

Further, the predetermined level is set to be lower than a current level supplied to a starter motor of the vehicle.

Further, according to a second aspect of the present invention, there is provided a power supply device for a vehicle, wherein the pair of output terminals 5A and 5B have
One terminal head selected from a plurality of types of terminal heads 5a and 5f is detachably attached.

According to a third aspect of the present invention, in the power supply device for a vehicle, the casing 2 includes the pair of output terminals 5A and 5A.
B is supported by the pair of output terminals 5.
It is characterized by being provided detachably so that positions A and 5B are interchanged.

Further, in the power supply device for a vehicle according to a fourth aspect of the present invention, an insulating protective shield 8 is detachably mounted on the housing above the pair of output terminals 5A and 5B. It is characterized.

According to a fifth aspect of the present invention, in the vehicle power supply device, the insulative protective shield is provided at an intermediate portion thereof.
a is rotatably provided with respect to the surface of the support plate 7 between the pair of output terminals 5A and 5B.
8c, 18c are formed so as to protrude above the pair of output terminals 5A, 5B with respect to the intermediate portion 18a.

Further, in the power supply device for a vehicle according to the present invention, a first engagement hole 7d is provided on the surface of the support plate 7 between the pair of output terminals 5A and 5B, and the insulating property is improved. When both end portions 18c, 18c of the protective shield 18 are located above the pair of output terminals 5A, 5B,
A second engagement hole 18e communicating with the first engagement hole 7d is provided. The second engagement hole 18e is inserted in a state where the first engagement hole 7d and the second engagement hole 18e communicate with each other.
It is characterized by having a regulating means (a screw 20, a screw 21) for regulating the rotation of 8.

According to a seventh aspect of the present invention, there is provided a power supply device for a vehicle, wherein the size of the housing is not larger than a size of a battery provided in the vehicle.

The vehicle display method according to claim 8 of the present invention is a vehicle display method for displaying a vehicle having a vehicle switch that can be switched between an on-vehicle electrical component 20 and a starter motor 24 for starting an engine. When the vehicle power supply device 1 is connected to the vehicle and the vehicle switch selects the vehicle-mounted electric component 20, power is supplied from the AC power source to the vehicle-mounted electric component 20, and the vehicle-mounted electric component 20 is supplied. The DC signal supplied from the AC power supply to the cell motor 24 when the cell motor 24 is selected by the vehicle switch based on the DC signal blocking means 13. Features.

The battery 50 mounted on the vehicle is removed, and the input terminal 3 of the vehicle power supply device 1 is connected to an AC power supply, and the output terminals 5A and 5B are connected to the vehicle. In this state, the lighting device can be operated. When the ignition key is set to the accessory or ON position, the switch of the vehicle-mounted electric component such as a car audio can be turned on and operated. When the ignition key is located at the start position, the supplied current level becomes equal to or higher than a predetermined level due to the start of the starter motor 24, the DC signal is cut off, and the engine does not operate.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle power supply device according to the present invention will be described. FIG. 1 is an exploded perspective view of the vehicle power supply device, and FIG. 2 is a perspective view of the assembled vehicle power supply device. As shown in FIG. 1 and FIG.
Has a housing 2. The housing 2 has a substantially rectangular parallelepiped shape which is the same as a battery for a vehicle. The dimensions of the housing 2 are as follows: width D = 127 mm, height H = 162 mm, length L
= 190 mm. In addition, the width D = 129 mm, the height H = 203 mm, the length L = 170 mm, and the width D
= 129mm, height H = 203mm, length L = 240m
m, width D = 173 mm, height H = 204 mm,
There is a size with a length L = 260 mm, a width D = 278 mm, a height H = 220 mm, and a length L = 520 mm.
The size of the housing 2 is adjusted to one of these or the battery having the smallest size among them.

A plug 3 as an input terminal connected to a commercial power outlet via a cable 3a is provided on a side surface 2a of the housing 2. Plug 3 has two AC
It has a 100V terminal 3b and one ground terminal 3c.

On the upper surface 2b of the housing 2, a rectangular opening 4 is formed along the length L direction of the housing 2. Case 2
Inside, a constant pressure power supply device 10 described later is provided.
Multiple lead wires 6 and 6 are drawn from the constant-voltage power supply device 10 through the opening 4 and connected to the pair of output terminals 5 and 5. Concave surfaces 2c, 2c slightly recessed from the upper surface 2b are formed at both longitudinal edges of the opening 4. Screw hole 4
a, 4a are formed.

The housing 2 is provided with a detachable support plate 7 having substantially the same contour as the opening 4. At both ends of the support plate 7, screw holes 7a, 7a are formed.
The screws b and 7b communicate with the screw holes 4a and 4a of the concave surfaces 2c and 2c and are screwed together. Screw hole 7 formed in support plate 7
A pair of output terminals 5 and 5 are supported slightly inside a and 7a. On the slightly inside of the supported output terminals 5, 5, + and-signs indicating the polarity of each output terminal 5, 5 are formed.

As shown in FIG. 3, the output terminal 5 includes a tapered terminal head 5a and a base 5b connected to the multiple lead wires 6. The terminal head 5a is
It is screwed and fixed to b. The base portion 5b is screwed to a pair of support portions 5c, 5c sandwiched between openings of the support plate 5, and is connected to the multiple lead wire 6 together with the washer 5d and the bolt 5e. As shown in FIG. 4, the terminal head 5a is freely replaceable with a bolt-nut type terminal head 5f having a hollow portion in the head of a semicylindrical shape.

As shown in FIGS. 1 and 2, a transparent insulating protection shield 8 for protecting the output terminals 5 and 5 is provided on the upper surface 2b of the housing 2. The protective shield 8 includes a pair of mounting pieces 8b, which are perpendicular to the rectangular shield plate 8a.
8c. Each of the mounting pieces 8b and 8c is formed parallel to the strip-shaped shield plate 8a. The pair of mounting pieces 8b and 8c are fitted to the periphery of the opening 4 extending in the width D direction of the housing 2. A U-shaped brass handle 9 is attached to the upper surface 2b of the housing 2.

Next, the constant voltage power supply 10 will be described. FIG. 5 is a schematic block diagram of the constant-voltage power supply 10. The input terminal 3 is a plug that is inserted into a commercial power outlet. The plug 3 includes two AC 100V terminals and one ground terminal. Line filter 3b
Removes the interference frequency of the input AC voltage. The input surge current prevention circuit 3c is for suppressing a rush current when an AC voltage is applied.

The AC-DC converter 11 converts the input AC signal from the input terminal 3 into a DC signal, and converts the primary rectifier / smoothing circuit 11a, the transformer 11b and the secondary rectifier / smoothing circuit 1
1c are connected in series. A switching circuit 1 is provided between the primary rectifying and smoothing circuit 11a and the transformer 11b.
1d is provided. The switching circuit 11d opens and closes an internal switch according to an opening / closing command from the DC signal cutoff unit 13.

The DC signal cutoff means 13 is provided with a detection circuit 12a for monitoring the current level of the DC signal output from the output terminal 5. The detected current signal is isolated by the light emitting / receiving element 12b, and the control circuit 12f
Sent to A current level at which an overcurrent occurs is set in the overcurrent prevention circuit 12d in advance. The set current levels are 40 A, 30 A, and 25 A, and can be switched to a desired level according to the vehicle type.

In the overvoltage protection circuit 12e, a voltage level at which an overvoltage occurs is set in advance. The setting level is 1
It is set in the range of 3.5 to 14.0V. The overvoltage protection circuit receives a voltage signal that fluctuates with a fluctuation in the output current via the light emitting and receiving element 12c and compares the voltage signal with a set level.
When the output voltage signal exceeds the set level, the control circuit 12
Output a signal to f.

The control circuit 12f includes an overcurrent prevention circuit 12d
Is compared with the output current signal, and when the output current signal exceeds the set level, a signal for opening the switch of the switching circuit 12d is transmitted. Then, after a predetermined time has elapsed, a signal for closing the switch is sent to the switching circuit 12d. This predetermined time is set corresponding to the time (for example, about 1 second) in which the key is returned from the START to the ON position. When the output from the overvoltage prevention circuit 12e is received, the output is fed back to the AC-DC converter 11 to make the output voltage constant. The set level set by the overcurrent prevention circuit 12d is set to be lower than the current level supplied to the self-motor of the vehicle to be exhibited.

Next, the operation of this embodiment will be described with reference to FIGS.
8 will be described. FIG. 6 is a schematic block diagram when the vehicle power supply device of the present invention is connected to a vehicle, and FIG. 7 is a flowchart thereof.

The engine of the vehicle is stopped, and the battery 50 is removed. The vehicle power supply device 1 is mounted at the position where the battery 50 was mounted (ST1). The output terminals 5 and 5 are connected by cable so that the polarity of the output terminals 5 and 5 is the same as that of the terminal on the vehicle side (ST2). When the polarity does not match with the terminal on the vehicle side, as shown in FIG. 8, the support plate 7 is removed and inverted so that the positions of the output terminals 5 and 5 are interchanged. 4 is fitted.

Since the terminal on the vehicle side differs depending on the type of vehicle, the terminal head 5a of the output terminal 5 is replaced and connected as required. When the tapered terminal head 5a is used, the vehicle-side terminal is sandwiched between the terminal head 5a and the base 5b and screwed. When the bolt-nut type terminal head 5f is used, the bolt and the nut of the vehicle-side terminal are fitted through the hollow portion.

Insert the plug 3 into the outlet (ST
3). When connected to a commercial power supply, an input voltage of 85 to 115 V is input. And 12V DC by AC / DC conversion
Output voltage signal. In this state, current is supplied to the lighting device 21 and the lighting device 21 can be operated (ST4).

Next, the ignition key is inserted into the key insertion slot (ST5). When the ignition key is switched to the accessory position (ST5-ACC, ON),
Electric current is supplied to electrical components 22 such as car audio and air conditioners that can be operated at the position of the accessory. The current consumption of the electrical component 22 that can be operated at the position of the accessory is also equal to or less than the current level set by the overcurrent prevention circuit 12d.
Operation can be performed without any trouble (ST6).

When the key is turned from the accessory to the ON position (ST5-ACC, ON), electrical components 23 such as a wiper and a power window which can be operated at the ON position.
Is less than or equal to the current level set by the overcurrent prevention circuit 12d, so that the operation can be performed without any trouble. Also, the output voltage fluctuates when switching from accessory to ON.
At this time, the output voltage is changed by the fluctuation so that the overvoltage prevention circuit 12e
A constant output voltage can be maintained even when the level exceeds the level set in (ST6).

Further, when the key is turned to the START position (ST5-START), a current is supplied in response to a request from the starter 24 (ST7). At this time, since the current level exceeds the current level set by the overcurrent prevention circuit 12d, a signal is sent from the control circuit 12f to the switching circuit 11b, the switch is opened, and the supply of current is cut off (ST8). Therefore, the starter 55 does not start and the engine does not start.

In a normal vehicle, the key slot S
Since the TART position is constituted by a toggle switch, the key is turned to the START position and immediately returned to the ON position (ST5-ACC, ON). At this time,
A signal is sent from the control circuit 12f, the switch of the switching circuit is closed again, and current is supplied to the vehicle-mounted electrical component 20.

After the display, the position of the key is turned off (ST5-OFF), the vehicle power supply 1 is removed (ST9-YES), and the battery 50 is replaced. When the display is continued (ST9-NO), the key position is switched again (ST5), and the on-vehicle electrical component 20 is operated.

In the above-described embodiment, the insulating protection shield 8 having the strip-shaped shield plate 8a and the pair of mounting pieces 8b and 8c perpendicular to the shield plate 8a is used. Never. For example, as shown in FIG. 9 and FIG. 10, a band-shaped insulating protection shield 18 having a depressed middle portion 18a may be used. The intermediate portion 18a is a portion to be attached to the support plate 7. A mounting hole 18b is formed in the middle portion 18a. Both ends 18c of the insulating protection shield 18 are bent in the horizontal direction and extend from an inclined portion 18d inclined obliquely upward from both ends of the intermediate portion 18a. Both ends 18c of the insulation protection shield 18
Project upward with respect to the halfway portion 18a.

A screw hole 7 c is formed at the center of the support plate 7, and a middle portion 18 a of the insulating protection shield 18 is formed.
Is screwed by the screw 19 in a state of communicating with the mounting hole 18b. Thereby, the insulation protection shield 18 can be rotated around the screw 19 as a fulcrum. Therefore, as shown in FIG. 10 (a), when attaching / detaching the vehicle-side terminal 6 and the output terminal 5, the insulation protection shield 18 is rotated so as to intersect the longitudinal direction of the support plate 7 so that the insulation protection shield 18 intersects. The two ends 18c of 18 are released from just above the output terminal 5.

In the vicinity of the screw hole 7c of the support plate 7,
A first engagement hole 7d is formed. A second engagement hole 18e is formed near the middle portion 18a. Thus, after the connection between the vehicle terminal 6 and the output terminal 5, the insulation protection shield 18 is rotated to extend along the longitudinal direction of the support plate 7 as shown in FIG. Both ends 18 c of the shield 18 are located immediately above the output terminal 5. At this time, the first engagement hole 7d and the second engagement hole 18
e communicates. Then, the screw 20 is inserted into a communication hole formed by the first engagement hole 7d and the second engagement hole 18e. Thus, the rotation of the insulation protection shield 18 can be restricted in a state where the both ends 18 c of the insulation protection shield 18 are located immediately above the output terminal 5. In addition, screw grooves are formed in the inner walls of the first engagement hole 7d and the second engagement hole 18e, and the screw 20 is used as the screw 21, so that the first engagement hole 7d and the second engagement hole 1d are formed.
8 e and the screw 21 are screwed together, so that the insulating protection shield 18 can be fixed to the support plate 7.

In the above-described embodiment, a cooling mechanism 30 may be provided on the side of the side surface 2a of the housing 2 as shown in FIGS. The cooling mechanism 30 includes a temperature sensor 31 such as a thermocouple, a control circuit 32, a cooling fan 33, and a ventilation net 34. A radiator plate (not shown) is provided in the secondary rectifying / smoothing circuit 11 c of the constant-voltage power supply device 10, and is connected to the temperature sensor 31. The control circuit 32 controls the driving of the cooling fan 33 based on the output signal of the temperature sensor 31.

When the temperature of the constant voltage power supply 10 rises, 2
The temperature of the heat sink attached to the secondary rectifying / smoothing circuit 11c also increases. The temperature sensor generates a voltage signal (thermal electromotive force) due to heat generated from the heat sink. This voltage signal is input to the control circuit 32. A predetermined voltage threshold value is set in the control circuit 32, and when the threshold value is exceeded, a drive signal is output to the cooling fan 33. A drive circuit (not shown) is provided in the cooling fan 33, and the drive circuit rotates the cooling fan 33 upon receiving a drive signal from the control circuit 32. Then, by the rotation of the cooling fan 33, the heat in the housing 2 is released through the ventilation net 34.

On the other hand, when the temperature of the constant-voltage power supply 10 decreases, the temperature of the heat sink attached to the secondary rectifying / smoothing circuit 11c also decreases. When the voltage signal output from the temperature sensor 31 falls below a predetermined voltage threshold, the control circuit 32 outputs a stop signal. As a result, no drive signal is output from the drive circuit in the cooling fan 33, and the cooling fan 33 stops.

In the above-described embodiment, the vehicle-side battery 50 is taken out of the vehicle and the vehicle power supply device 1 is mounted on the vehicle. However, the present invention is not limited to this. For example, as shown in FIG. 13, the vehicle power supply device 1 may be connected while the battery 50 is mounted on the vehicle. In this case, a pair of output terminals 5
A and 5B are connected to connection cables 40A and 40B. On the other hand, the cable 60B connected to the minus terminal 50B on the vehicle side is disconnected. Plus terminal 5 on the vehicle side
The cable 60A connected to 0A is connected as it is. Then, the connection cable 40A connected to the output terminal 5A on the plus side is connected to the plus terminal 50A of the battery 50. A connection cable 40B connected to the negative output terminal 5B, a cable 60B connected to the vehicle negative terminal 50B,
Are connected by a fixing tool including a bolt 41 and a nut 42. Thus, the vehicle power supply device 1 can be used with the battery 50 mounted thereon, and the labor for replacing the battery 50 and the vehicle power supply device 1 can be reduced.

[0045]

According to the present invention, the battery can be freely exchanged with the battery mounted on the vehicle, so that the on-vehicle electrical components of the vehicle can be freely tested and safely displayed without operating the vehicle engine in an exhibition hall or the like. it can.

By providing a plurality of types of interchangeable terminal heads at the output terminals, the same vehicle power supply is used to supply power to the vehicle side even if the terminal of the vehicle differs depending on the vehicle type. be able to.

Further, by configuring the pair of output terminals such that the positions of the pair of output terminals are switched with respect to the surface of the housing, even if the vehicle-side terminals drawn out of the vehicle are different for each vehicle type, the polarity can be handled. Then, it can be connected to the output terminal.

Further, by providing an insulative protective shield for covering the upper part of the pair of output terminals so as to be detachable from the housing, the safety can be improved by preventing a short circuit caused by carelessness of the operator. It is in. Further, by making the insulating protective shield rotatable, attachment and detachment of the vehicle-side terminal and the pair of output terminals can be further facilitated.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a vehicle power supply device of the present invention.

FIG. 2 is a perspective view of the vehicle power supply device of the present invention.

FIG. 3 is an exploded side view of a tapered output terminal.

FIG. 4 is a side view of an output terminal head having a kamaboko shape.

FIG. 5 is a schematic block diagram of a constant-voltage power supply.

FIG. 6 is a schematic block configuration diagram when the constant-pressure power supply device is mounted on a vehicle.

FIG. 7 is a flowchart when the constant-pressure power supply device is attached to a vehicle.

FIG. 8 is a perspective view of the vehicle power supply device when the support plate is inverted.

FIG. 9 is a diagram in which another protective shield is used in the vehicle power supply device of the present invention.

FIG. 10 is a diagram illustrating an operation when another protective shield is used in the vehicle power supply device of the present invention.

FIG. 11 is a perspective view when a cooling mechanism is provided in the vehicle power supply device of the present invention.

FIG. 12 is a block diagram when a cooling mechanism is provided in the vehicle power supply device of the present invention.

FIG. 13 is a schematic diagram showing another example of attachment in the vehicle power supply device of the present invention.

FIG. 14 is a schematic block diagram showing a conventional vehicle power supply device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Power supply device for vehicles, 2 ... Case, 3 ... Input terminal, 4 ... Opening 5A, 5B ... Output terminal, 7 ... Support plate, 8, 18 ... Protective shield 10 ... Constant voltage power supply, 11 ... AC-DC Conversion means, 12
... DC signal blocking means

Claims (8)

(57) [Claims] 1. A vehicle power supply for supplying power to a vehicle, comprising: an input terminal connected to an AC power supply; and an AC-terminal for converting an AC signal input from the AC power supply via the input terminal to a DC signal. DC conversion means, a pair of output terminals that are drawn from the AC-DC conversion means and supply power to the vehicle, and monitor the current level of the DC signal output from the output terminal, and determine that the current level is a predetermined level. A DC signal cutoff unit that cuts off the supply of the DC signal to the vehicle when the level is equal to or more than a level, and a housing in which the AC-DC conversion unit is housed and the pair of output terminals is provided on a surface. Wherein the predetermined level is applied to the cell motor of the vehicle.
A power supply device for a vehicle, wherein the current level is set to be lower than a supplied current level . 2. The vehicle power supply according to claim 1, wherein one terminal head selected from a plurality of types of terminal heads is detachably attached to the tip portions of the pair of output terminals. apparatus. 3. The housing according to claim 1, wherein a support plate on which the pair of output terminals is supported is detachably provided so that respective positions of the pair of output terminals are interchanged. Item 3. The vehicle power supply device according to item 1 or 2 . 4. A above the pair of output terminals, an insulating protective shield, the vehicle power supply according to any one of claims 1 to 3, characterized in that it is detachably attached to said housing apparatus. 5. The insulating protective shield, wherein a halfway portion thereof is provided rotatably with respect to a surface of the support plate between the pair of output terminals, and both end portions thereof are provided with respect to the halfway portion. The power supply device for a vehicle according to claim 4 , wherein the power supply device is formed so as to protrude above the pair of output terminals. 6. A first engagement hole is provided in a surface of the support plate between the pair of output terminals, and when both end portions of the insulating protective shield are located above the pair of output terminals. A second engaging hole communicating with the first engaging hole is provided, and the second engaging hole is inserted in a state where the first engaging hole and the second engaging hole communicate with each other to rotate the insulating protective shield. The power supply device for a vehicle according to claim 5 , further comprising a regulating means for regulating. Wherein said housing, claim and equal to or less than the size of the battery provided in the vehicle 1 to 6
The power supply device for a vehicle according to any one of the above. 8. A vehicle display method for displaying a vehicle provided with a vehicle switch capable of switching between an on-vehicle electrical component and a starter motor for starting an engine, wherein the vehicle power supply according to any one of claims 1 to 7. Connecting the device to the vehicle, supplying power from the AC power supply to the on-vehicle electrical component when the on-vehicle electrical component is selected by the vehicle switch, enabling the on-vehicle electrical component to operate; Wherein the DC signal supplied from the AC power supply to the starter is cut off based on the DC signal cutoff means when the starter is selected.